US2217114A - Method of producing pattern effects on fabrics - Google Patents

Description

Patented Oct. 8, 1940 UNITED STATES PATENT i OFFICE METHOD OF PRODUCING PATTERN EFFECTS ON FABRICS Frldolin Hefti, Herisau, Switzerland, assignor to Aktiengesellschaft Cilander, Herisau, Switzerland No Drawing. Application October 10, 1938, Se-

rial No. 234,310. 7 In Germany July 9, 1938 5 Claims.

covered by the resist, the original condition of the fabric, that is, the density and softness of the latter remain unaltered.

It is further known, to obtain pattern effects on fabrics by printing the latter with cellulose solutions or cellulose ester solutions or albumin pastes, if desired, together with pigments, and to subsequently parchmentize the fabric, whereby the whole fabric is stiffened throughout, the protected portions being also stiffened either by effect of the covering layer itself, or due to the perviousness of the matter to the parchmentizing acid.

By addition of pigments the patterning effects can be rendered more contrasting.

It has now been found that on fabrics composed of natural fibers of vegetable origin, which have been made transparent in topical manner, that is, in local or limited areas, beautiful pattern effects can be produced by impregnating such fabrics with a solution of a compound which is capable of forming insoluble precipitates with solutions of other compounds by single or double transformation, and by subsequently treating the fabric with the last-named solution.

Experience has shown that the precipitate firmly adheres to the non-transparent portions,

whereas the transparent portions receive the same either not at all or only to a negligibly small extent. By this means one is enabled to enhance the contrast between the parchmentized and nonparchmentized portions of the fabric without resorting to printing the pigments on the fiber, by means of adhesives, and fixing the pigments thereon, so that in contrast to the known methods of applying pigments the pigmented portions remain soft.

interesting efi'ects can also be obtained if the non-parchm'entized portions are topically or locally provided with a resist prior to the application of theflrst solution.

Examples of solutions which are adapted to produce the pigments on the fibre, by means of this invention, are contained in the following table in which to the left the impregnation solutions, in the middle the aftertreatment compounds, and to the right the pigments produced 5 on the fiber are indicated.

Barium chloride Sulphuric acid Barium sulphate. Titanium chloride Caustic soda lye Orthqor meta-titame acid. Barium chloride Sodium biohromate Barium bichromate. Sodium tungstate. Barium chloride Barium tungstate. 10 Zinc acetate Potaissium ierrocya- Zinc ierrocyamde.

Barium chloride Sodium molybdate Barium molybdate.

The impregnation of the fabric may be effected in any desired manner by padding the respective solution on the fabric, soaking it therewith, or 15 passing the fabric through this solution. The solution of the second agent partaking of the reaction may also be padded on, or the fabric impregnated with the first solution may be passed through a bath which consists of this solution. 2 Alternatively, combinations of the above mentioned means or solutions may be used- If desired, the fabric may be subjected after the application of the pigment to a shrinking treatment, by means of suitable chemicals, in consequence of which the pigmented portions contract and the contrastive effect is still more accentuated. Also here it is feasible to protect any desired portions of the fabric which are adapted to be shrunk by a gum printing, prior to effecting 30 the shrinkage, with the result that embossed effects are obtained on the fabric.

Examples 1. A muslin fabric is printed with an ordinary gum resist, then parchmentized, rinsed and dried. There'upon the fabric is soaked with a 5% barium chloride solution, squeezed out to about 100%, and dried. Then follows a treatment with sulphuric acid of 10% concentration, and rinsing. Upon 40 drying, the fabric is shrunk in caustic soda lye of 30 B. for 2 minutes, and is then finished.

2. A fine cotton fabric, having been pretreated as described in Example 1, is soaked with a solution of titanium chloride of a. specific weight of 1.282 and a dilution of 1:1, and is treated without previous drying in a caustic soda lye of 3 B. for 10 minutes, whereupon it is rinsed. After the drying, the fabric is shrunk in a lye of 30 B. for 2 minutes.

3. A yellow pigment is obtained when the fabric, which had been soaked with a solution of barium chloride, is passed through a bath con- I. 200 gr. of sodium tungstate in 1 l. of water II. 100 gr. of barium chloride in 1 l. of water Thereupon, the fabric is rinsed, dried and finally shrunk with a concentrated caustic soda lye.

5. A fabric having been pretreated as described in Example 4 is printed with a second resist prior to the shrinking, and is then dried. Thereupon, it is treated in caustic soda lye of 30 B. for 2 minutes without stretching, rinsed, and dried.

6. A cotton fabric having'been printed 'with a resist indifferent to parchmentizing acids is parchmentized, and dried, has padded thereonto a solution of 100 gr. of zinc acetate in 1 1. of water and is treated without previous dry-- ing with a solution of potassium ferrocyanide of 14 B., then applied a cold rinsing, and dried. Various changes and modifications may be made in the practice of my invention without departing from the principle or spirit thereof, by adding customary practice and established knowledge of the art to the present disclosure and the scope of the appended claims is not to be regarded as limited except as specified therein.

I claim:

1. In a method of producing pattern effects on fabrics, the steps comprising locally parchmentizing a fabric of natural vegetable fibers, impregnating said fabric with a solution of a chemical, reacting said chemical with a solution of a reagent to produce awater-insoluble pigmenting precipitate in the fabric, and removing said precipitate from the parchmentized portion of the fabric, whereby the precipitate produced in situ in the non-parchmentizedv portion of the fabric is fixed against removal.

2. In a method of producing pattern effects on fabrics, the steps of locally parchmentizing a fabric composed of natural vegetable fibers, applying a resist in pattern form to said fabric, then impregnating the portion of the fabric not parchmentized or covered with said resist with a solution of a chemical, reacting said chemical with a reagent in solution to produce a water-insoluble pigmenting precipitate in the portions of the fabric not protected by resist, and removing said precipitate from the parchmentized portion of the fabric, whereby the precipitation of the pigment in situ in the nonparchmentized, unprotected portion of the fabric fixes the pigment therein against removal.

3. In a method of producing pattern effects on fabrics, the steps of topically parchmentizing a fabric composed of natural vegetable fibers,

applying to the fabric a solution of a chemical, then reacting said chemical with a solution of a reagent to produce a water-insoluble pigmenting precipitate in the fabric, whereby the precipitate produced in situ in the non-transparentized fabric is fixed against removal, removing the precipitate from the parchmentized portions of the fabric where it is not fixed, and subjecting only the non-parchmentized portions of the fabric to 'a shrinking treatment to emphasize the natural opacity of the fabric and the opacity resulting from the presence of the pigment therein. v

4. In a method of producing pattern effects on fabrics, the steps of topically parchmentizing a fabric composed of natural fibers of vegetable origin, applying to the fabric a solution of a chemical, reacting said chemical with a solution of a reagent to produce a water-insoluble pigmenting precipitate in situ in the fabric, whereby the precipitate is permanently fixed in the non-parchmentized portions of the fabric, then topically applying a resist to the fabric, and applying a shrinking agent which shrinks only the non-parchmentized, unprotected portions of the fabric.

5. In a method of producing pattern effects FRIDOLIN HEF'II.